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Annotation of embedaddon/libnet/src/libnet_build_isl.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  *  $Id: libnet_build_isl.c,v 1.9 2004/01/03 20:31:01 mike Exp $
                      3:  *
                      4:  *  libnet
                      5:  *  libnet_build_isl.c - cisco's inter-switch link assembler
                      6:  *
                      7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
                      8:  *  All rights reserved.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  *
                     31:  */
                     32: 
                     33: #if (HAVE_CONFIG_H)
                     34: #include "../include/config.h"
                     35: #endif
                     36: #if (!(_WIN32) || (__CYGWIN__)) 
                     37: #include "../include/libnet.h"
                     38: #else
                     39: #include "../include/win32/libnet.h"
                     40: #endif
                     41: 
                     42: libnet_ptag_t
                     43: libnet_build_isl(u_int8_t *dhost, u_int8_t type, u_int8_t user, u_int8_t *shost,
                     44:             u_int16_t len, u_int8_t *snap, u_int16_t vid, u_int16_t index,
                     45:             u_int16_t reserved, u_int8_t *payload, u_int32_t payload_s,
                     46:             libnet_t *l, libnet_ptag_t ptag)
                     47: {
                     48:     u_int32_t n, h;
                     49:     libnet_pblock_t *p;
                     50:     struct libnet_isl_hdr isl_hdr;
                     51: 
                     52:     if (l == NULL)
                     53:     {
                     54:         return (-1);
                     55:     }
                     56: 
                     57:     n = LIBNET_ISL_H + payload_s;           /* size of memory block */
                     58:     h = 0;
                     59: 
                     60:     /*
                     61:      *  Find the existing protocol block if a ptag is specified, or create
                     62:      *  a new one.
                     63:      */
                     64:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ISL_H);
                     65:     if (p == NULL)
                     66:     {
                     67:         return (-1);
                     68:     }
                     69: 
                     70:        memset(&isl_hdr, 0, sizeof(isl_hdr));
                     71:        memcpy(&isl_hdr.isl_dhost, dhost, 5);
                     72:     isl_hdr.isl_type    = type;
                     73:     isl_hdr.isl_user    = user;
                     74:     memcpy(&isl_hdr.isl_shost, shost, 6);
                     75:     isl_hdr.isl_len     = htons(len);
                     76:     memcpy(&isl_hdr.isl_dhost, snap, 6);
                     77:     isl_hdr.isl_vid     = htons(vid);
                     78:     isl_hdr.isl_index   = htons(index);
                     79:     isl_hdr.isl_reserved= htons(reserved);
                     80: 
                     81:     n = libnet_pblock_append(l, p, (u_int8_t *)&isl_hdr, LIBNET_ISL_H);
                     82:     if (n == -1)
                     83:     {
                     84:         goto bad;
                     85:     }
                     86: 
                     87:     if ((payload && !payload_s) || (!payload && payload_s))
                     88:     {
                     89:          snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                     90:                             "%s(): payload inconsistency\n", __func__);
                     91:         goto bad;
                     92:     }
                     93: 
                     94:     if (payload && payload_s)
                     95:     {
                     96:         n = libnet_pblock_append(l, p, payload, payload_s);
                     97:         if (n == -1)
                     98:         {
                     99:             goto bad;
                    100:         }
                    101:     }
                    102: 
                    103:     /* we need to compute the CRC for the ethernet frame and the ISL frame */
                    104:     libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
                    105:     return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H,
                    106:             LIBNET_PBLOCK_ISL_H));
                    107: bad:
                    108:     libnet_pblock_delete(l, p);
                    109:     return (-1);
                    110: }
                    111: 
                    112: 
                    113: /* EOF */